Rotor construction.



E. ELSHOPF.

ROTOR CGNTRUCTION. l

APPLICATION FILED s141117, 1906.

Patented Oct. 13, 1908.

3 SHEETS-SHEET 3A n uw SAX BERNARD nLsiioFr, or noawoon, omo,

dynamo-electric machines therotary field members of turbo-alternators.

Assienon To aLLis-cHALiiEn's COMPANY, A clon-` PoRA'rioN or NEW JERSEY,'AND THE BULLocK ELECTRICy MANUFACTURING COMPANY,

A coRrcRA'rioN or omo.

Specieatio'n of Letters Patent. I

v turrn coNsrRUcTroN,

Patented oct. 1:3, isos Application led September 7, 190.6. Serial No. 333,612.

Toall'fwhom it mag/'concertar l Be it known that I., .BERNARD ELS-HOFF, .citizen ofthe United States, residing 4at 1Sorwoodin the county Vo fHainilton and State' 5 of Ohio, have inventedcertain new'and useful Improvements in Rotor Constructions., of

' Ah ich thefollowingis a full, clear, and 1exact specification, I

- Llyinvention relates to rotarymem'bers of One of the objects of my invention is'to provide a rotary member for high speed nia' clines which is strong, compactand' consists 1 5 offew parts all ofWhichare-well protected against displacement by centrifugal foi'ce.v

A further object is to provide an improvedv and simplified means for supporting, adj usting -and retaining in position theportions of 2l) vthe coils extending beyond the core:

My invention consists in the details of con-v i struction and combination and arrangements 'of'parts described inthe specification andsetforth in the appendedclainis.

For a better understanding of. my

invention vreference is had to. the accompanying drawings in which Figure 1' isa partial sectional elevati-on of'a rotary-field member constructed according to my invention the section being taken along the line 1%1 of Fig. 2; Fig. 2 is' .a'n endelevation, parts being broken` away; and in section Fig..3 is a partial elevation with the endcover for the field coils removed, showing the supporting 'and bracing insulating blocks betifeen* the yfcoils and the end of the rotor;

Fig. 4 is -a similar viewof the rotor revolved 90' `l 'roi n theposition shown in Fig'. 3; Fig. 5 is la section .along the .line 5-5 of Fig. 4;

' 40` Fig. G isa View similar to Fig. 1,-thesection being taken ,approximately along the line 6-6 of Figg; Fig. 71's a view similar to Fig.

l1 showing a slight. modification of my inven tion; Fig. 8 is a partial endelevation ofa collar4 vor sleeveemployed in the .--onstruction .shown vin Fig'. 1,for supporting'the wedges or seat-s which retain in position theend-turns 'of the coils; Fig. 9 is alsectional elevation of the same; Fig..` 1() isapei'spective yiew'of one 50 ol" the coil seats oi' Wedgesyanfdz Fig. 11 -isa perspective viewA of one ofi the insulating sl'ioes for,thecoilretaining seats-orwedges.; My inveiitii'm consistsiri the details of con. structidii,' .aiuzl iii the,roiiibinations'. and arand particularlyto slots 19 in theiencls of t are all connected in series, the fourcoils of rangements of parts described inv thespeci'' i'ication and set forth lin the appended claims.

Referring now' to the figures of the'drawing I vhave shown at 10 a portion of a rotary member which is in this' case a rotary field i member of a. turbo-alternator.' The core'. 11 ofO the rotary .member is solid and is prefer-l ably provi-dedwith integral shaft projections i12 'to which .the shaft ends 13 areseoured. The core and shaft projections are preferably made fro-ma single steelfforging'. The lcore is lprovidedv Witli'radial slots 14 for the ,reception -of eld coils, and With solid pole pieces 15, a two p ole rotor being here shown. i The pole pieceslare in this case separated byeig'ht' 'radial-coil slots, there being' f our concentric Coils, per pole; lEach polepieceisprovided at each 'end of the core vwith a-.fventilating slotv or recess 16 which entends tromY the periphery inward. .toward the `sha-ft projff'ectiornllThe coils, the end-turns of which are shown-l at 17, areretained in position by non-magnetic coil retainingwedgps 18 which engage.. l

e teeth. The' coils each group being connected together by strapsor conductors 2() Whichextend in this case from the outerv layer of one coil to' the innermost layer of the adjacenticoil asis vided with vcollector. leads, one of Whic "is shown in Figs. 1, 2, -6 and 7, for connectingthe coils to the 'collector rings (.notshown). Thev arts of the coils which project beyond t e core are held in positionsotbat they can not be 4distorted or displaced by centrifugal force andvso that there 'can be no' relatiye'movement or vibration of disparte, which might destroy the insulation. UA1

the end-turns of the eld-coils consisting of al clearly shown in Wig. 1;' The coils are' roi each end'of the core, is' an end-cover'21 for 9 5 A ring or cylindrical portion 22' surioundiiigthe'` "c'oils, 'and a poition'23 integral therewith and. extending inwardly'at-:rightv angles to theyl 'of the ring 2 2 of eachf-eidyeover engages and fits closely witliin, .a"'groove at the edge ofthe core, and# the inwardlyext-ending portion 23 rests upon radial 'ai'nis 24g f alriiig or "collar 25'iittingfdirectly on the shalt .projection of.'

thev core. The inneredge ol'wthe inwardly extending portion 2 3 offeach end-,cover 21, and the outerl ends fof ther-adialarms '24'are' provided with-,interlitting notched portions 'insulating materiel.

y against the ends ol the wedges.

forming rabbet joints. Each ring or collar 25 and the end-cover are pressed inward toward the core and :ire held in position by a ring or nut which engages a threaded portion 27 of the'slieit projection. The endturns are preferably separated from each of'` the outer surrounding rings 22 by one or more sheets oi" insulation 28.

The end-turns ol' the coils at each end of the core are supported and pressed outwardly against the ring 22 of the end-cover2l by wedges 29, thel inner surfaces ol' which are inclined, and are seated in slots 8O of a sleeve or collar 3l haviiig' an inclined or beveled outer surl'nee. The sleeves or collars, one of whit-his shown in Figs.. 1, 8 and 9 are mounted on the cylindrical poi-tions of the shaft projections, each ol" the sleeves being provided with a screwdlircaded portion 32 which engages a screw-threaded portion 33 on the corresponding shalt projection.

ing .shoe oi channel-shaped member 34 which nia-y be pressed into shape from ish-paper or other suitable sheet insulation, or may be molded into the desired shape from plastic The shoes 34 insulate the coils Al'roni the wedgesbut do not interfere with the circulation of air between and around the end-turns ot' the coils, as would be the case if the'wedges and coils were separated from each other by sheets oi' insulating material. in Figs. 10 end li respectively are shown in persj'iective one of the wedges and one ot' 'the insulating shoes. In this case eight ,equally spaced wedges are employed at each end ol' the core, and the rings 25 each have eight radial arms 24 located opposite the wedges. .i provide means `l'or adjusting each wedge 29 separately so that all portions el' the coils are forced outwei'd against' the cylindrical portions 22 of the end-covers with equal pressure. ln this case this is accomplished by means of set screws 35 mounted in the radial arms 24 and bearing Thus each wedge can be separateiy adjusted and hence all the coils can. be forced outward against the end-ring with equal pressure, regardless ol' slight linequalities in the thickness ol' the coils. i

The projecting portions ol' the coils are carefully spaced apart and braced and are i! .b\ spaced iioni the enwcoveis and t ie cole y -insulating spacingmembers :is will now. be.

described.

ltel'erri'ng particularly to Figs. 3, 4 and 5, it is selen that between the coils at their points of emergence from the core are wedge-shaped blocks ol' insulating material :36 which fit tightly l etwceritlie coils and extend inward to the rounded pri-rt of the shaft projection'. initiated opposite each pole and within the innermost coil of each group is `a wedgeslxapcd insu lining member 37 consistingofan Fitting closely over each wedge 2Q is an insulatarc-shiped pprtion 38 which extends cross the en of t e pole and substantially radial arms l39 which extend inward, and rest against the face of the pole. It is seen that the shape ofthe bracing members 37 is such as not Lto interfere with the outward flow of j air through the recesses 16 in the ends or' the poles.

The members 37l are separated in this case from the innermost coils of the groups byinsulating blocks 40. The insu-4 lating blocks brace the coils and prevent the coils from vibrating and rubbing against the` comparatively sharp edges of the slots, and hence eliminate the danger of abrasion of the coil insulation. The'middle portioi'isof the' end-.turns of the coils are carefully spaced from e'ach other by spacing members 41 These spacing members also serve to hold in position the straps 20, which connect to gether the coils of each group. As is shown in Figs. 1, 3, 4 and 7 the spacing members veach consist of two blocks between which the straps 2O are tightly held. The straps 20 of the two groups of coils are preferably located at op osite ends of the machine, and theren fore t e spacing members at each end of the core, for one group of ,coils may consistof solid blocks 42, the spacing members at the same end of the core butfo'r the opposite group of the coilsconsisting of two parts asV shown in Fig. 3. The 'outermost coils are spaced from the inwardly extending portion' 23 of each end-cover by spacing members consisting of insulating blocks ftinountcd on'an insulating ring'44 (shown in cross sec-` tion.)

Referring now to Fig. 6 it is seen that the collector lead 45 which is attached to the outermost coil ot the group extends inward between the coil retaining wedges and -outward alongthe shaft through an opening 45 betweentwo' of the radial arms 24 of the ring 25, over the ring or nut'26 which retains the ring 25 in position and out' to the'coll'ectoi' ring (not showin) VThe two collector rings are )referablv located'at opposite ends of the mac ine, and hence only one collector lead ,is shown. The collector leeds are' held in po-V sitionon the nut 26 by an outer surrounding I 'have'l shown' a slight modifica? i tion of my invention. The Acore 47. here shown is similar to the core ll'shown in Fig. 1 except thet'the shaft rojections 48 are inclined and support direct y the coil seats or wedges, thus dispensing' with the wedge supporting sleeves or collars. ln this case, the inclined slif'tfl projections are provided with I grooves 49 in which are seated the 'coil supporting wedges 29. As in the irst construction the end-turns at the end of the core are' surrounded by an end-cover 21 having aninwardly extending portion Zwhich engages the out- `ing the projecting ends'oi the coils, oech endl cover havin en inwardly extendin portion, e ring or col ur mounted on theu she yt or sha'tt projection et each end of the` core, seid ring or collar-listing radial erins orv projections engaging the inwardly extending;- portion of the. end-cover, s sleeve having env outer be'vl' sled surfec'e mounted on each 'shelt projection, seid vsleeve being provided with' e pluchine, e core, field coils corried thereby, seid' blocks-between the. end-turns of soiv coils,

reiity of slots, e coil' sector wedge loceted in eschjslot, endineans carried by the radial arms or projections on the `rind-s orv coller for" adjusting' each Wedge seperate y. I i

`1.0. In s djns'ruoelectric machine, e slotted core,l solo core ,having field coils -ex'tendmg beyond the ends of vthe core, 'en end-cover i surroundin@ the projecting ends of thecoils, et erich endJ ofv the. core, coil 'seats or Wedges for forcing. the end-turns outwardly sgeinst therend-cover, end an insole-ting shoe iitting over each Wedge. v

1 l. ln e, (lyrisme-electric machine, e slotted core l;' coils cerried thereby, having end-turns beyond the ends of the core, end-covers surroundingv the endturns, coil seats having.,r their inner faces beveled or inclined, sind coil -seets resting lupon s member having en 1nclined loutersurfswe s11- insulstinff shoe ittincr 7 C over escl: coil-sectior `insulsting the letter from the end-turhs, and means ior adjusting each coil seat seperately.

12.".[11 .o rotor of s dynamic-electric ma;

coils ,being arranged-,in groups, eechvroup consisting oi fag-number of concentricel y sr-` rsnged'coils, conductors for connecting the coils of eechgroup in series, and s icing ssidfspscingblocis serfving' elsoss supports for'the seidconductors.

13;. In e rotor ot s dynsrnolefectrlc machine, o core, groups of concentric field coils A carried. thereby, strep conductors for conlmeeting the coils of each grou in series, and a ends ot coils which project beyond the ecosse 'core and the shaft projections, ineens for bracing the coils at their points of emergence from the core comprising members of'insuloting;y material. bearing affsinstthe ends of the core lond extending Lbetween adjacent coils, seid members also extending inward beyond the innermostloyers of the coils sind engaging .the shaft projections, rigid covers inclosing the ends oi the coils, ond Ineens between the' shaft projections end the endsof the coils ,for forcing the letter outward in firm engagement with the end covers.

15. ln. a rotor oi t dynemo-electric mochine, e core, seid core having rediel slots und pole peces,lssid pole 'pieces being recessed et their ends forming Ventilating openings, s group of coi centriccoils around euch pole piece end exiending beyond the ends of thc core, end s .fedgesheped block oi insulating materiel `between the sides of the innermost coil of-esch group and in en'sgernent with the ends of the core, scid bljoclf: being cut sway froin'the inner side .so es to permit un outward circulation oi oir through the recess in the )01s. Y I 1 l i6. n e rotor oi e dynamo-electric mechine, e ,slotted core, coils located in the slots of the /core end extending beyond the ends thereof, en end-cover surrounding the projectingendefot the coils, s ring or out for holding seid cover in positiomfe collector lend extending outwordfroin seid coil. over seid ring or nut, and e second ring located over said ring 'or nut tor holding the collector lead in position. j v

, '117.111,11 rotor of .o dynamo-electricienchine, s slotted corehafvin shaft projections,

coi'lslocated inthe slots .0 seid core and extending beyond'the ends thereof, on cnd- .cover surrounding seid coils, o lcoller on s,

shaft projection 'end supporting the cndcover',y Wedges for forcing scid coils outward y against the end-cover, s nut for holding said end-cover in position, s collector leed extending outward from one of said coils through seid coller end e ring surrounding said `nut sind holding the collector leed in. position..

ln testimony whereof l 'edit my signature,

in the presence ottwowitnesses.

Witnessesz ARTHUR l. Kwis, FRED J. Kisser. 

